Journeyman Electrician's Raceway Systems Flashcards
7 cards from real Journeyman Electrician’s Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Journeyman Electrician's Raceway Systems flashcards as text
Per the NEC, what is the maximum total degrees of bends permitted in a single run of conduit between pull points?
Answer: 360 degrees
The NEC limits conduit runs to a maximum of 360 degrees total (equivalent to four quarter-bends) between pull points to allow conductors to be pulled without excessive friction or damage.
What is the maximum support interval for Electrical Metallic Tubing (EMT) in a horizontal installation per NEC 358.30?
Answer: 10 feet
Per NEC 358.30(A), EMT shall be supported at intervals not exceeding 10 feet to prevent sagging and maintain the integrity of the raceway system.
How close to a box, cabinet, or conduit termination must EMT be supported, per NEC 358.30(A)?
Answer: 3 feet
NEC 358.30(A) requires EMT to be supported within 3 feet of every outlet box, junction box, device box, cabinet, or other termination to prevent the conduit from pulling loose at connections.
Which type of conduit requires expansion fittings to accommodate thermal expansion, especially in long straight runs exposed to temperature variations?
Answer: Rigid PVC (Schedule 40)
Rigid PVC conduit has a thermal expansion coefficient roughly eight times greater than steel, so expansion fittings are required per NEC 352.44 for long runs subject to temperature changes.
In which of the following locations is EMT specifically NOT permitted to be installed per NEC 358.12?
Answer: Where subject to severe physical damage
Per NEC 358.12(1), EMT is not permitted where it will be subject to severe physical damage because its thin walls can be crushed or deformed by heavy impacts.
Per NEC Chapter 9, Table 2, what is the minimum bending radius to the centerline for 2-inch EMT conduit with conductors that do not have a lead sheath?
Answer: 12 inches
NEC Chapter 9, Table 2 specifies a minimum centerline bending radius of 12 inches for 2-inch EMT conduit when the conductors do not have a lead sheath.
What is the maximum support interval for Rigid Metal Conduit (RMC) per NEC 344.30(B)(1)?
Answer: 10 feet
Per NEC 344.30(B)(1), RMC shall be supported at intervals not exceeding 10 feet, the same standard spacing that applies to EMT and IMC installations.